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- Helps troubleshooting PC motherboards that does not pass POST (power on self test), or simply shows black screen and won't boot
- 4-digit numeric trouble code display
- Displays diagnostic code when system error prevents computer from booting
- Also displays diagnostic/error code when computer freezes
- Works on all PCs and laptops
- Supports connection via PCI slot, USB port, and parallel (printer) port
- Detects PCI/ISA bus clock frequency
- Internal onboard Speaker, and can optionally connect to PC Speaker
- Easily identify whether problem is due to CPU, memory, display card, or other devices
- Important: turn off power before connecting or removing the diagnosis card
- USB cable and PC speaker connection cable included
- English user's guide and diagnostic code lookup booklet included